Home / 429-618

Finding the Third Proportional to 429 and 618

Calculator

Solution

The third proportional to 429 and 618 is: 890.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    429 : 618 = 618 : x
  2. Step 2: Convert to fraction form
    429/618 = 618/x
  3. Step 3: Cross multiply
    429x = 618 × 618
  4. Step 4: Simplify right side
    429x = 381,924
  5. Step 5: Solve for x
    x = 381,924/429
  6. Step 6: Final answer
    x = 890.27

Related Problems

Find third proportional to 214.50 and 309
Half scale
Find third proportional to 858 and 1,236
Double scale
Find third proportional to 431 and 621
Similar ratio
Find third proportional to 643.50 and 927
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.